ENGINEERING, INC.
®
PSW495B
INSTRUCTION
SHEET
M3421/0902
INSTALLATION INSTRUCTIONS FOR OMEGA®
PSW495 EXPLOSION-PROOF SWITCH
WIRE LEADS
18˝ LONG
1⁄2
NPT MALE
1.50
(38)
1.50
(38)
1.7
(43)
(5)
.21 DIA. THRU
MOUNTING
HOLES
2 PLACES
6.4
(156)
STANDARD RANGES
30˝ Hg Vac
30, 60, 100, 200, 400, 600,
1000, 2000, 3000 psi
INTRODUCTION
The PSW495 pressure switch is a precision built U.L. approved control
device which features a single or
dual SPDT, hermetically snap-action
switch. Several wetted material constructions for compatibility with
pressure media may be obtained.
Series PSW495 switches have a fixed
deadband which will be within the
limits noted on the nameplate.
MOUNTING
The PSW495 snap-action pressure
switch has an anodized aluminum
body and conduit fitting with a 316
stainless steel pressure port.
Two holes are used to surface mount
the control. Location of the holes is
shown on the general dimension
drawings. Mount on a vibration-free
surface in any orientation. When tightening control to pressure line, always
use the hex on the pressure connection. NEVER TIGHTEN BY TWISTING
THE BODY OR THE CONDUIT HEX.
1.15
(29)
2.00
(51)
1⁄2
ELECTRICAL CONNECTION
The PSW495 switch is available in
SPDT or (2) SPDT circuit. Wire leads
(18˝) are provided for both switches.
SPDT
Common
Normally Open
Normally Closed
Ground
– White
– Blue
– Red
– Green
(2) SPDT
Common
– (JJ) White/Black
(LL) White/Green
Normally Open – Blue
Normally Closed – Red
Common
Normally Open
Normally Closed
Ground
– Black
– Blue/Black
– Red/Black
– Green
ELECTRICAL RATING
(General Purpose)
11A 125/250Vac resistive;
5A 30Vdc resistive
(Narrow Deadband)
5A 125/250Vac resistive
(Gold Contacts) 1A 125Vac
ORDER CODE
SPDT DPDT
J
JJ
P
L
N/A
LL
NPT FEMALE
ADJUSTMENT OF SETPOINT
A single setpoint adjustment nut is
located centrally inside the cover of
the body. Align bottom of adjustment
nut slot with scale for approximate
pressure setting.
The adjustment nut is locked in place
with a set screw located centrally in
the body below the adjustment nut. A
5⁄64˝ Allen wrench is used to adjust the
set screw.
For accurate setpoint calibration use
Omega PCL-1B handheld calibrator
with a pump or Omega deadweight
gauge tester.
As received, the pressure switch will
normally be set to approximately 90%
of the indicated range. Pressurize the
system to the required setpoint and
turn the adjustment nut until switch
changes mode. When the setpoint has
been achieved raise and lower pressure to ensure that setpoint is correct.
After installation of the control
replace the cover to protect internal
parts from the environment.
M3421 8/99 DPS-5C-1P-10/99 Printed in U.S.A.
omega.com
TM
Servicing Europe:
®
OMEGAnet On-Line Service
www.omega.com
®
Benelux:
Postbus 8034, 1180 LA Amstelveen, The Netherlands
Tel: +31 (0)20 6418405
FAX: +31 (0)20 6434643
Toll Free in Benelux: 06 0993344
e-mail: [email protected]
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FAX: +420 (0)69 6311114
Toll Free in Czech Rep.: 0800-1-66342
e-mail: [email protected]
FAX: (203) 359-7700
France:
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FAX: +33 (0)130 699 120
Toll Free in France: 0800-4-06342
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FAX: (514) 856-6886
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Internet e-mail
[email protected]
Servicing North America:
USA:
ISO 9001 Certified
Canada:
One Omega Drive, P.O. Box 4047
Stamford CT 06907-0047
TEL: (203) 359-1660
e-mail: [email protected]
976 Bergar
Laval (Quebec) H7L 5A1
TEL: (514) 856-6928
e-mail: [email protected]
TEL: +49 (0)7056 3017
FAX: +49 (0)7056 8540
Toll Free in Germany: 0800 TC OMEGASM
e-mail: [email protected]
For immediate technical or application assistance:
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA®
Customer Service: 1-800-622-2378 / 1-800-622-BEST®
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN®
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA
Mexico:
Tel: (001) 800-826-6342
En Español: (001) 203-359-7803
United Kingdom: P.O. Box 7, Omega Drive,
ISO 9002 Certified
FAX: (001) 203-359-7807
e-mail: [email protected]
[email protected]
Irlam, Manchester,
M44 5EX, United Kingdom
TEL: +44 (0)161 777 6611
FAX: +44 (0)161 777 6622
Toll Free in England: 0800 488 488
e-mail: [email protected]
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected applications.
MADE IN
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months
from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the normal one (1) year
product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage
on each product.
If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will
issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the
unit is found to be defective it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects
resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of
design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having
been tampered with or shows evidence of being damaged as a result of excessive corrosion; or current, heat, moisture or
vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control.
Components which wear are not warranted, including but not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in
accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED
WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive and
the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based.
In no event shall OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under
10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should
any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any
way, OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and additionally,
purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use
of the Product(s) in such a manner.
RETURN REQUESTS / INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY
PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S
CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.
FOR WARRANTY RETURNS, please have the following
information available BEFORE contacting OMEGA:
1. P.O. number under which the product was PURCHASED,
2. Model and serial number of the product under warranty,
and
3. Repair instructions and/or specific problems relative to
the product.
FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA:
1. P.O. number to cover the COST of the repair,
2. Model and serial number of product, and
3. Repair instructions and/or specific problems relative to
the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to
any electronic medium or machine-readable form, in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.